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Mechanical Engineering
Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.
10,989 Questions
There have been several reports as to the F-22's overall mission ready rate and maintenance requirements.
Lockheed-Martin's F-22 spokesman says that the overall mission ready rate has improved from 62% in 2004 to 68% in 2009, and is "on track" to reach 85% by the time the fleet reaches 100,000 flight hours.[173] The Washington Post says that between October 2008 and May 2009, just 55 percent of the deployed F-22 fleet has been available.[174] Air Force Magazine reported that the Washington Post article's was incorrect and that mission capable rates have been climbing, and by June 2009 stood at 62.9%, compared to approximately 70% for the mature F-15 and F-16 aircraft.[175][176] The Air Force Association states that the current mission capable rate for the entire F-22 fleet is 70%,[177] which is in line with the 71.2 percent the even newer Super Hornet managed on its first wartime deployment.[178]
In July 2009, the Air Force reported that the F-22 requires more than 30 hours of maintenance for every flight hour, with the total cost per flight hour of $44,000.[174] The Office of the Secretary of Defense puts that figure at 34 hours of maintenance per single hour of flight at a cost of $49,808 per hour of flight. The Pentagon requirement is for 12 hours of maintenance per flight hour.The F-22 also reportedly encountered a critical failure every 1.7 hours.[N 2] The F-22 had required maintenance every 0.97 flight hours in 2004. This improved to 3.22 flight hours per maintenance event in production Lot 6 aircraft.
The aircraft's radar-absorbing metallic skin is the principal cause of its maintenance troubles, with skin repairs accounting for more than half of the maintenance. Another source of maintenance problems is that many components require custom hand-fitting and are not interchangeable.[174] The canopy visibility has degraded more rapidly than expected, with refurbishments at 331 flight hours, on average, instead of the required 800 hours.[174] Pentagon officials respond that measuring flying costs for aircraft fleets that have not reached 100,000 flying hours is premature. They say improvements have been made since 2008, and the F-22s are on track to meet key performance parameters by 2010.[174]However, rain has caused "shorts and failures in sophisticated electrical components" when the Raptors were briefly posted to Guam.[180]
Each Raptor requires a month-long packaged maintenance plan (PMP) after every 300 flight hours.[181]
What experience do you have in this field?
I have experience in various areas within this field, including research, analysis, writing, and project management. I have worked on a range of projects and collaborated with teams to achieve successful outcomes. My expertise includes data analysis, report writing, and strategic planning.
Why allied planes were better than axis planes?
That is a good question. At the start of the war, Germany and Japan had more airplanes that US or Britain or France and many of them were better. The reason was that the US and Britain were not spending as much on new technology development or new airplane designs before the war. Most countries were just coming out of the Great Depression and could not afford to spend much on development. On the otherhand, Germany was building more and more.
After a few years into the war, the Allies manufacturing caught up with the Germans. They put more resources to designing new airplanes and engines. The Germans had some great engineers and designers but many were distracted with new designs of Hitler's "wonder weapons" that was going to end the war.
For example, the best German fighter aircraft was the Me-109 and Fw-190. As the Allied aircraft designs improved, the Germans tried to enhance these with later models. The radial engine of the Fw-190 had limitations and they could not make it produce more horse power. The Fw-190 Model D had to resort to an in-line engine. The Me-109 was improved by the F model but as it was enhanced with more armament with the G model, its performance could not keep up with the new Allied aircraft such as the P-51D.
Regarding Bombers, the Germans wanted fast bombers in the beginning of the war and neglected any 4-engine strategic bomber design. The Allies already had the B-17 designed and it went through several improvements. This left the Luftwaffe with a significant disadvantage in the long-range strike capability.
One last theory that I have is that German engineering design machines with too close tolerances. This means that it requires that maticulate adjustment and tunning that was difficult to repair in the field. There is a big difference between overhauling a Mercedes car engine and a Chevy engine.
See the following website:
http:/wwwzperiodzawszperiodzorg/certification/CW
Why is necessary to hammer after welding a joint?
it's not. Welders do use a chisel/hammer to knock the slag off, but a wire brush will do the same thing. Some welders do use a hammer to align their fit-up when the tack is still hot, but not after they have welded. If the slag is left on, it may cause expedited corrosion, this is why it should be cleaned, but in most top quality shops - a wire brush is used.
It is necessary to hammer a weld joint after welding CI to CI as the induced stress are relieved to a large extent and also the cracking can be avoided in case of CI
What is the purpose of the thrust wear down or low thrust oil pressure trip?
To prevent excessive axial movement of the rotor.
the main purpose of a wrap-a-round is to make a straight line around a pipe to aid in cutting the pipe to its proper length. it is used mostly as a template or a straight edge
How do you convert CFM to CMH?
Cmh = cubic meters per hour
cfm = cubic feet per minute
m3/hr * 35.3ft3/m3 * hr/60minutes = ft3/minute
So, 1 cmh = 0.5883 cfm
To apply a force to something. The lever enables a small force at one end to be converted into a greater force at the toher end depending on the location of the fulcrum (the point at which it pivots),
Ida npsh pot you had last week npsh Ida?
WDF dia npsh WDF WDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDFWDDFFFF a lot of enters WHO THE **** MADE THIS GAY QUESTION BECUZ THEY ARE VERY DUMB I THINK THATS WHY ****en RETARD!!!!!!!!!!!!!!!!!!!!!!!!!!
How long does it take to cut 3 schedule 160 pipe?
depends on how you cut it and the size of the pipe, but with a machine blade, it shouldn't take more than couple minutes
How do you tell the difference between stainless steel and HSLA steel?
Stainless steel is generally shiney and hsla is rusty almost. Plus stainless is non magnetic unless it is type 409
Previous papers of bhel supervisor trainee of mech engg?
Yes, The previous question papers for the supervisor trainee of mechanical engineering conducted by BHEL.
Which is the important mechanical property of the material for extrusion purpose?
plasticity in the important mechanical property for the extrusion purpose.
What is circumferential welding?
A type of weld produced around the outer surface of a cylindrical workpiece. Circumferential welds are used to fabricate structural pipes
What are the Stress-strain characteristics of ductile materials?
initially there is the linear elastic region which obeys the hooks law :stress is directly proportional to the strain.
at the end of the linear elastic region the ductile material reaches the yield point beyond which any change in dimensions become permanent. the material goes through a yield plateau in which stress is constant and the strain changes.
after crossing the yield plateau the ductile material goes through the strain hardening region in which the deformation is permanent but as the region goes on the stress increases with the strain. here the strength of the ductile material increases as it is strain hardened. at a point it reaches the ultimate load point. This is the maximum load taken by the material. after which further deformation causes decrease in strength or the stress goes on decreasing finally breaking at the breaking load point. this region is called the post-ultimate region.
Where to get information on 7hp Eska motor Model 1931-A?
i would try elginoutboards.com both sam thing plus some links to eska
What is MPA RMC after someone's name?
Well, if they are in Canada it might mean they did a Master of Public Administration degree at Royal Military College......
What is the answer to convert 300 cubic meters per hour to cubic feet per minute?
300 cubic meters per hour is about 176.57 cubic feet per minute.
- Formula: Cubic meters per hour x 0.5886 (rounded) = cubic feet per minute
